Question

A tangent galvanometer measures current. True or false.

• A. True
• B. False

Answer 1

The correct option is A True

When a current is passed through the galvanometer coil, then a magnetic field $B$ is produced at right angles to the plane of the coil ie, at right angles to the horizontal component of earth's magnetic field $H$. Under the influence of two crossed magnetic fields $B$ and $H$, the magnetic needle of galvanometer undergoes a deflection $\theta$ which is given by the tangent law. Using tangent law, we can find a relation
$I\propto \tan \theta$
Which clearly indicates that the tangent galvanometer is an instrument used for detection of electric current in a circuit.